Image processing apparatus, method, and program

Abstract

The present disclosure relates to an image processing apparatus, a method, and a program that can reduce delay that may possibly occur in intra prediction.An encoding apparatus excludes, when a CU split structure for luminance and a CU split structure for chroma are to be determined, for the CU split structure for chroma, a CU split structure that indicates a minimum size in at least one of a vertical direction or a horizontal direction to determine a CU split structure for the chroma, and encodes an image with the CU split structure for luminance and the CU split structure for chroma to generate an encoded stream. The present disclosure can be applied, for example, to an image processing apparatus.

1 . An image processing apparatus comprising:
 a control section configured to exclude, when a CU split structure for luminance and a CU split structure for chroma are to be determined, for the chroma, a CU split structure that is a minimum size in at least one of a vertical direction or a horizontal direction to determine a CU split structure for the chroma; and   an encoding section configured to encode an image with the CU split structure for luminance and the CU split structure for chroma to generate an encoded stream.   
     
     
         2 . The image processing apparatus according to  claim 1 , wherein
 the CU split structure that is a minimum size in at least one of the vertical direction or the horizontal direction has a size of 2×2, 4×2, or 2×4.   
     
     
         3 . The image processing apparatus according to  claim 1 , further comprising:
 a cost calculation section configured to calculate a cost for the CU split structure for luminance and a cost for the CU split structure for chroma, wherein   the control section determines, for the luminance, a CU split structure for luminance on a basis of the cost for the CU split structure for luminance, and   inhibits, for the chroma, calculation of the CU split structure cost for chroma for the minimum CU split structure and determines the CU split structure for chroma on a basis of the cost for the CU split structure for chroma.   
     
     
         4 . The image processing apparatus according to  claim 1 , further comprising:
 a setting section configured to set syntax in which the minimum CU split structure is described, wherein   the control section determines, for the chroma, the CU split structure for chroma by excluding the minimum CU split structure on a basis of the syntax.   
     
     
         5 . The image processing apparatus according to  claim 4 , further comprising:
 a transmission section configured to transmit the syntax and the encoded stream.   
     
     
         6 . The image processing apparatus according to  claim 4 , wherein
 the syntax includes the SPS.   
     
     
         7 . The image processing apparatus according to claim  1 , wherein
 the minimum CU split structure is defined by a standard.   
     
     
         8 . An image processing method performed by an image processing apparatus, comprising:
 excluding, when a CU split structure for luminance and a CU split structure for chroma are to be determined, for the chroma, a CU split structure that is a minimum size in at least one of a vertical direction or a horizontal direction to determine a CU split structure for the chroma; and   encoding an image with the CU split structure for luminance and the CU split structure for chroma to generate an encoded stream.   
     
     
         9 . A program for causing a computer to function as:
 a control section configured to exclude, when a CU split structure for luminance and a CU split structure for chroma are to be determined, for the chroma, a CU split structure that is a minimum size in at least one of a vertical direction or a horizontal direction to determine a CU split structure for the chroma; and   an encoding section configured to encode an image with the CU split structure for luminance and the CU split structure for chroma to generate an encoded stream.   
     
     
         10 . An image processing apparatus comprising:
 a control section configured to exclude, when a CU split structure for luminance and a CU split structure for chroma are to be determined, for the chroma, a CU split structure that is a minimum size in at least one of a vertical direction or a horizontal direction to determine a CU split structure for the chroma and determine a CU split structure for the luminance and a CU split structure for the chroma on a basis of an encoded stream generated by encoding an image with the CU split structure for luminance and the CU split structure for chroma; and   a decoding section configured to decode the encoded stream to generate the image on a basis of the CU split structure for luminance and the CU split structure for chroma.   
     
     
         11 . An image processing method performed by an image processing apparatus, comprising:
 excluding, when a CU split structure for luminance and a CU split structure for chroma are to be determined, for the chroma, a CU split structure that is a minimum size in at least one of a vertical direction or a horizontal direction to determine a CU split structure for the chroma and determine a CU split structure for the luminance and a CU split structure for the chroma on a basis of an encoded stream generated by encoding an image with the CU split structure for luminance and the CU split structure for chroma; and   decoding the encoded stream to generate the image on a basis of the CU split structure for luminance and the CU split structure for chroma.   
     
     
         12 . A program for causing a computer to function as:
 a control section configured to exclude, when a CU split structure for luminance and a CU split structure for chroma are to be determined, for the chroma, a CU split structure that is a minimum size in at least one of a vertical direction or a horizontal direction to determine a CU split structure for the chroma and determine a CU split structure for the luminance and a CU split structure for the chroma on a basis of an encoded stream generated by encoding an image with the CU split structure for luminance and the CU split structure for chroma; and   a decoding section configured to decode the encoded stream to generate the image on a basis of the CU split structure for luminance and the CU split structure for chroma.